The wire fence and watch tower of Yatala Labour Prison in Adelaide's north.

ABC News

Convicted killers who refuse to help police find their victims' remains would be denied the opportunity for parole, Labor has promised if re-elected.

There are 42 ongoing police investigations in South Australia dating back to 1966 in which missing persons are presumed murdered and Labor says the policy is designed to bring closure to victims' families.

It has also pledged to introduce new laws giving courts the power to extend parole orders for the most serious offenders.

Under the proposal, violent criminals and sexual predators could be subject to lifelong supervision once they are released from jail.

Premier Jay Weatherill says the 'No Body, No Parole' policy would provide a strong incentive for criminals to cooperate with authorities.

"They stay inside until they provide information about where the body or where the remains are," he said.

"This causes massive suffering to the families of the victims of murders. It should be incumbent upon them to offer what information they have about the whereabouts of their victim and until they do that they should remain imprisoned."

Attorney-General John Rau cited the murder of backpacker Peter Falconio, whose remains have never been found, as such a case.

"The Attorney-General in the Northern Territory has called again for [Bradley John Murdoch] to tell police where the body of his victim is," he said.

"That is one example. In South Australia there are many others."

Mr Rau says some serious offenders deliberately do not seek parole, instead choosing to serve out their sentences so they can be released back into the community with no supervision.

"The courts are going to be able to say 'sorry, you're not going to be able to do that. You will be supervised'," he said.

Shadow Attorney-General Stephen Wade says the Liberals would support more stringent parole laws and the proposal is worth looking into.

"Those left behind by murder are entitled to resolution. If parole laws can be strengthened to help give them closure, a Marshall Liberal government will change the laws," he said.

"But after 12 years of Labor government, only five days before an election, people need to ask: is the Labor party genuine on law and order? They've had 12 years to act."

Labor promises new police station for Henley Beach

Labor has committed to building a new police station at Henley Beach, if re-elected.

The station would cost $5.3 million and replace the 50-year-old station on Military Road by the middle of 2016.

Premier Jay Weatherill says the station would increase emergency response capabilities and allow for additional police.

"When you see an old run-down police station obviously that sends the wrong message," he said.

"This police station... will allow the 40-odd people that work out of here to have the state-of-the-art facilities necessary to fight crime and to keep our communities safe."

Mr Weatherill says Labor would also develop a phone app to make it easier to report minor crimes to police.

Liberals commit to funding SA share of NDIS

The Liberal Party has committed to funding South Australia's share of the National Disability Insurance Scheme.

The Liberals also want to set up a community forum to improve relationships between Government and the disability sector.

Liberal leader Steven Marshall says he would also aim to increase available accommodation.

Mount Lofty Ranges to become hub for bike riders

Labor has pledged to turn the Mount Lofty Ranges into an international destination for mountain bike riders.

It says it will spend $1.5 million on upgrading fire tracks and connecting existing bike trails in parks throughout the Adelaide hills, including Cleland, Belair, Anstey Hill and Cobbler Creek.

Tourism Minister Ian Hunter says a phone app will also be set up to make the paths easier to navigate.

"We'll design the trails to be available for different types of mountain bike users [and] families with young people," he said.

"There will be trails for them but there will be more challenging trails for mountain bike enthusiasts and we think their reputation will spread widely."